package cn.tedu.v3;

import java.io.*;
import java.net.BindException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 * Version3.0 升级 双向链接【客户端与服务器相互说话】
 *
 * 优化空间：代码结构、流没有关
 */
public class Server {
    private ServerSocket serverSocket;
    public Server() {
        try {
            serverSocket=new ServerSocket(2545);
        } catch (BindException e){
            System.out.println("端口号重复创建");
        } catch (IOException e) {
            System.out.println("申请端口号失败");
        }
    }

    public void start(){
        try {
            while(true){
                System.out.println("----等待客户端链接----");
                Socket socket=serverSocket.accept();
                String ip=socket.getInetAddress().getHostAddress();
                System.out.println("一个客户端链接成功了");
                new Thread(new CS(socket)).start();
                }
        } catch (IOException e) {
            System.out.println("服务器端通讯断开了");
        } finally {
            if(serverSocket!=null&&!serverSocket.isClosed()){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    System.out.println("服务器关闭失败");
                }
            }
        }
    }
    public static void main(String[] args) {
        new Server().start();
    }
    private class CS implements Runnable{
        private Socket socket;
        private String ip;
        public CS(Socket s){
            this.socket=s;
            ip=socket.getInetAddress().getHostAddress();
        }
        public void run() {
            PrintWriter pw=null;
        //    BufferedReader br=null;
            try {
                //1.读入定义
                BufferedReader br= new BufferedReader(new InputStreamReader(socket.getInputStream()));
                //2.定义写出
                pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);
                //1.1读入功能：存线程中
                new Thread(()->{
                    try {
                        String message;
                        while((message= br.readLine())!=null){
                            System.out.println("客户端说："+message);
                            //增加写出一句话：读完卡住等待输入
                            System.out.println("服务器请输入");
                        }
                    } catch (IOException e) {
                        System.out.println("客户端读入失败");
                    }
                }).start();
                //2.1
                Scanner input=new Scanner(System.in);//后台卡住
                while (true) {
                    System.out.println("服务器请输入");
                    String say=input.nextLine();//得到控制台输入值
                    //打印：服务器端说的内容/文本---打印客户端
                    pw.println("服务器说："+say);
                }
                } catch (NullPointerException e) {
                System.out.println("IO流传入对象,有对象为Null，立马核对，建议try块中对象可能赋值为Null");
                } catch (UnsupportedEncodingException e) {
                System.out.println("客户端或者服务器端：字符集不一致");
                } catch (IOException e) {
                System.out.println("通讯过程中，传输出现错误");
                } finally {
               /* if (br != null)
                    try {
                        br.close();
                    } catch (IOException e) {
                        System.out.println("通讯结束：关闭失败");
                    }*/
                    if (socket != null&&socket.isClosed())
                        try {
                            socket.close();
                        } catch (IOException e) {
                            System.out.println("通讯关闭失败");
                        }
                    }
        }
    }
}
